Air-control shutter



March 24, 1931. v J M |LVA|NE H I I 1,797,293 Q AIR CONTROL SHUTTER Filed Jan. 31, 1930 2 Sheets-Sheet 1 3% v ca 5 Mfil'ch 1931. J. H. MCILVAI NE 1,797,293

' AIR CONTROL SHUTTER Filed Jan. 31, 1930 2 Sheets-Sheet 2 7 pi w s Patented Mar. 24, 1931 "UN TE STATES.

JOHN H. MQILVAIN oF nvnnstron. ILnINoIs a v AIR-CONTROL s'HuT'rEn Application filed January31, 1930.; Serial n 1424,1320.

This invention relates to an air control "shutter especially designed for use in C011,", nection with the centrifugal fan or blower" of a liquid fuel burner, but, of course, adapted for use with other kinds of burners, re-

gardlessof-the kind of fuel being used.

with a burner operating with a continuous butvariabl'e flame, from a low load flame to a'high load-fiame't-hrough a number-of intermediate heat-s suflicient to maintain the die sired temperature in the home orother building being heated under all usual and ordi naryconditions. This, kind of operation,

therefore,requiresthatoil and air be fed in proper proportions and indefinitepredeter 'More'specifically' stated, the air control shutter of my invention is designed for use mined amounts for the different loads, a very small amount of air beingrequired for;

the low load flame and the maximum amount for the high load flame and amounts in protherefore, the principal object of my invenj portion-for the intermediate loads. It is,"

2 tionto provide a shutter which enables the 'air' adjustments for the different loads to bemade easily andaccurately, the adjustments for all loads fromthe low load flame v through .theintermediate" loads to the high load flame I being each made independently. bythe, set

0 ting of closures] on openings provided for" the different loads whereby to produce the proper combustion throughout the'range of heats and thusmake for economy and efliciency.

Tl ie invention is illustrated in the accomf panyingdrawing wherein Flgure 1 is a side view of the blower show-' ing theair control shutter, of my invention applied thereto 46 Fig. 2 is a section on the line 2 2 of Fig.1

' 1 Fig.3 is a face vievv of the movable shutter plate removed. from the blower andhaving none of the closures thereon for the different shuttergopenings; and

Fig. 4 is a similar view of the stationary I shutterplate. p The "same reference numerals are applied to corresponding parts throughout the views; "The-air control shutter is shown mounted onthe' housing '5 of a centrifugal fan 01 1 blower thathas an, air delivery pipe 6 at tached thereto and leading to the combu's I tlon chamber into=which the oil to be burned 7 is delivered. A; constantspeed motor, a portionof whose housing appears at7, drives a. pump' to feedthe oil at 'difie'rent rates acdrive'the blower wheel 9,desi.gned forthe d elivery'of air un'der low pressure tothe air 7o del very pipe 6 leading'to the combustion chamberur On the inlet side of the blower housing is mounted aplate-10 enclosing the peripheralportionsof the blades of the blower Wheel, and having a central air inlet opening ll. The shutter of my invention for 'controling the air supply to the blower, andconsequentlyto the combustion chamber, con sistsof a stationary shutterplate 12bolted to.

the'blowe'rhousingalong with the plate 10,

as indicated at 13,;and: a movableishutter plate '14, -'mounted' to i turnrelative' to the, 'plate-12on a'bolt 15 passin-g through a center I hole in the plate 12 and threaded in a-central boss on the plate-'14:. I A coiled compression as spring 16 under the head of the bolt: 15 acts through .fhe'latter to hold the 'platel l seated on the plate-12 soa's to prevent leaka ge of air between the contacting surfaces.

-'The stationaryashutter-plate .12 has. two: QQ'

diametrically opposed open quadrants 17 and 18 and interme'diateclosed quadrants 19cand 20. Themovableshutter plate 14 has diametricaly opposed .closedquadrants 21 and 22, and intermediate "open. quadrants on the C3 same radius as the open quadrants 17 and 18 of the stationary plate 12. .The open quad= rants in the movable shutterplate 14 are grade uated in size, comprising openings 23,24 and 25V at one side 'offthe shutter plate and. open; 1 I.-

ings 26, 27 and 28 at the opposite side,and each is adapted to be closed to a variable degree by a closure plate held in position on the movable, shutter plate 14, as by means of screws 29, the said closure plates for the openings being numbered 30 to '35, inclusive. When the movable shutter, plate, 14 is in closed positi ,1l, that is, Withgthe two qiiadrantscentaiiiingf he openings 23 to 28, inclusive, superposed on the closed quadrants 19 and of the stationary shutter plate, it is obviousthat:noneoiithese openings will pass air to the blower inlet opening 11. Under these conditions the blower fan wheel merely revolves ;in the housing and delivers no air to the combustion chamber except what is. passed I throughtwo other openings 3(i and 37, PIGViClQd';i1L the movable shutter plate 14 j one-a smaller i 'ad i us than the other openings 23; to 28, hereinafterreterredtto as thelow load inlet openin These openings register -,With areuate eX-ten; sions- 36 and 37 of the open qnadrantslfgaa d 18 in the stationary shutter plate. 12. Plates 7 3&andware-provid d a closures. for the openings- 36 and 37, IBSPQCfiVBLy; M

In, operation, themoyable: shutter plate 1 4:

isin closed position When'the;handle4.0 ;thereof is; in; eng gem ntw th a tep pin prQ-' jecting from; the; stationary shutter; plate 1 2,; and uader hese conditions he c os re plates; 38 {and 39..are arranged tobje adjusted oyer; the, openings 36-, and37;to positions-where onlythe proper amount oi"; air -is; allowed to enter; tor; supporting combustion atlowload. I This is a, veryimportant adjustment beeausethe ad; mission of toojinuch air at lowloadanig-ht result inthe flame being extinguished The, control aflordediby the closure plateson the.- openings isas accurate as need-beand-permits; adjust-ment downto. precisely the right amount of air, as distinguished from other, means, which have been provided in the ast-: and" which afiorded; only a, comparatiyely coarse adjustment: Afterthe adjustment for thelow loadfflanie has been madethe mom. able shutter plate it is turned one stepat time andadjustments offthe-closure plates to are made one at ai time, the conti'QLvalrVo in the oil feed line being opened widerand wider at each stepby. reasonof: alink conned,

tion=42 with anarm onthestem .ofsaid valve The conditions peculiar. to each-installation, responsible for the. fact that greater on'less; amounts of air; may be required itivaliioas; loads-'inproportion tothe' fueli feed inio rden to assure complete and proper combustion, are,

thereiore', met by; the-provision; of an air con-.1

trol shutter made in. accordancehw ith my. invention that perm-its ofivariationiin the;

amount of airfor' ever-y fuel; feeds to. pmdsu ce; proper combustion It wil lvnom bejo bsemzeda that theishutten ope-ningss23, emits carted cliametricalgly opposite; the. plates;

3', am 5', rewsemnmaae ms opening to cut down the draft through the opening to the correct amount and is then loek'edlin such positioniby the tightening of the screws. hen the handle comes into engagement'with the stop pin 43 the shutter is inits high loac l p osition and all of the openings in the movable shutter plate are passing Jl- .=-fi x z ar rwsh in akeepe ine 11 o the blower. In conelnsion, itgisto enotied r the Wo l hut P te ;:.t s s n; he: eventjth at automatic control is desired, as for example, ineansofia suitable thermostatic. regulator laving connection v.vitl1 ;the-link ha n, 4

It is believed the foregoing description con v ys l ar unde and-ins ota i f: he j sa dad aateses tmyinreationcont ol hutter mecha ism h cha acter des ibed, the. combination, of; sta io ary pan a re a ive yqmow ab e ut e part m vab rom one limit. pesi ii nit i nothe r ativ hereto, said; sta-r i naay l t hav ng: ne o more air nlet ope ings, aidzmo ab e pan ing a plu al-1 ty Qf' ai inlet ope i gs arranged o be moved; in succession; into registration. with the aforesaid openings'by operation of; the, movablcipart, means forvarying. the size of said n aiirair inlet; openings,all of saidmrain air inlet; openingsybeing out; of; register with the aforesaid: openings When the l ilOv able, part one limit position, the. stationary patt having a secondary air, inlet opening, here eing a; ec d ry r nl t cr me-gpro iided in. the o ab e pan a a ge t registerthere'w-ith when said movable; part isinthelimitposition referrecttm and means; for; pa -ping; the size of said; last mentioned openlng.

24 I111 an ir C ntro hut er mechan sm of the character describeththe combination 01 a sta onary lmt e z pa a d i i fl'l fi 'y 1 tatablesliutterpart ar -ranged to turn from t aymther-linlg connection 14 is prepidec a one limit position to another, the. stationary 7 ,"size'o'f said opening."

openings, the stationary part having at least oneof the air inlet quadrants provided with a cut-out portion constituting an extension of one part thereof and the rotatable part having a secondary air inlet opening registering therewith, and means for varying the 3. In an air control shutter nechanism'of the character described, the combination of a stationary shutter part, and a relatively rotatable part arranged to be turned from one limit position to another, the stationary part having diametrically opposed air inlet quadrants and the rotatable part having diametrically opposed closed quadrants arranged to cover the same when the rotatable partis in one limit position, the rotatable part having diametrically opposed series of air inlet openings on a given radius, and an adjustable plate for each opening, said air inlet openings being arranged to be moved in succession into registration with the air vinlet quadrants in the turning of the rotatapart having diametrically opposed secondary air inlet openings on a diiierent radius from the aforesaid air inlet openings arranged to register withsaid cut out portions when the rotatable part is in the first men-v tioned limit position, and an adjustable plate for each of thesecondaryopenings. i

4. In an air control shutter mechanism of the character described, the combination of a stationary shutter part anda relatively 1O tatable shutter part arranged to he turned "from one limit position to another, said stationary part having diametrically opposed rants arranged to cover the same when the rotatablepart'is in one limit position, the

simultaneously come into register with the air inlet quadrants proper in the turning of the'rotatable. part toward'the other limit poi sition, and an adjustable plate for each of the secondary openings. i

In Witness of the foregoing'I aflix my signature.

JOHN 'MCILVAINE.

air inlet quadrants, and the rotatable part having diametrically opposed closed quadrotatable part having diametrically opposed series Ofair, inlet'openings on a given radius and an adjustable plate for each opening,

said air inlet openings being so located as to successively register with the air inlet quadrants in the turning of the rotatable part toward the other limit position, the we,

cession {alternatinggfrom one series to the other so that said plates are adjustable sepa rately for one opening after another, the stationary part having the air inlet quadrants provided with diametrically opposed cut-out portions constituting lateral extensions of said quadrants, the rotatable part having diametrically opposed secondary air inlet openings on a different radius from the aforesaid air inlet openings, both of which areinregister with said cut out portions when the rotatable part is in the first mentioned limit position and are arranged to 

